01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large skillet over medium heat, cook ground beef until well browned, breaking apart with a wooden spoon. Drain excess fat if needed.
03 - Add chopped onion, green bell pepper, and minced garlic to skillet. Cook for 3 to 4 minutes, stirring frequently, until softened.
04 - Stir in tomato sauce, tomato paste, ketchup, Worcestershire sauce, smoked paprika, brown sugar, salt, black pepper, and oregano. Simmer mixture for 8 to 10 minutes, stirring occasionally, until thickened. Remove skillet from heat.
05 - Slice the baguette lengthwise. In a mixing bowl, combine softened butter, finely minced garlic, chopped parsley, and 1/4 teaspoon salt until thoroughly blended.
06 - Spread the garlic butter evenly over each bread half and set them cut side up on the prepared baking sheet.
07 - Bake bread for 5 to 6 minutes, or until lightly golden. Remove the tray from oven.
08 - Spoon a generous portion of sloppy joe filling onto one half of each toasted bread. Top with shredded mozzarella and grated Parmesan cheese.
09 - Return assembled bread to the oven and bake for an additional 5 to 6 minutes, or until cheese is melted and bubbly.
10 - Sandwich the bread halves together. Press gently, slice into portions, and serve hot.